<!DOCTYPE html>
<html>
<head>
	<script src="https://unpkg.com/@reactivex/rxjs@5.0.0-beta.10/dist/global/Rx.umd.js"></script>
	<script src="listing1_7.js"></script>  
	
	<meta name="description" content="Listing 1.7">
	<meta charset="utf-8">
	<title>Listing 1.7</title>
</head>
<body>
  <input id="student-ssn"></input>
</body>
</html>